Re: [Qemu-devel] Advice on some configuration parameters

[Paolo Bonzini]

Il 12/02/2013 14:05, Fabio Fantoni ha scritto:
> I'm making patches to enable some qemu upstream features in xen that are
> missing in libxl.
> I'm trying to do it just by giving arguments to qemu, and I want them to
> be dynamic (e.g. without physical addresses if possible) and concise.

They should use physical addresses, otherwise changing the VM hardware
in trivial ways may cause a waterfall effect and cause Windows to
reactivate.

> If I try to set up virt-manager so that it doesn't point to a file, it
> uses this configuration:
> 
> -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7
> -device
> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5
> 
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2
> 
> This seems to differ from the configuration file, e.g. you have
> multifunzion=on only on the first uhci

That doesn't matter.

> , besides I can't understand how many physical ports are defined.

There are 6 ports, controlled by either the EHCI for USB 2.0 devices
(the EHCI controls 6 ports) or by one of the three UHCI for USB 1.1
ports (one UHCI has 2 ports).

> I tried setting 9 usbredirection
> channels in virt-manager but that configuration doesn't change and no
> errors are reported, but I doubt that physical ports are being define
> dynamically.

QEMU creates hubs automatically I think in that case.

> About spice vdagent at the moment I'm using this configuration that
> seems to work:
> -device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent -device
> virtserialport,chardev=vdagent,name=com.redhat.spice.0
> 
> But I noticed that virt-manager use this slightly different one:
> -chardev pty,id=charserial0 -device
> isa-serial,chardev=charserial0,id=serial0 -chardev
> spicevmc,id=charchannel0,name=vdagent -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
> 
> Are there any problem with the more concise one I'm using?

It is the same.

Paolo